perf probe: Fix a bug that --line range can be overflow

Since line_finder.lno_s/e are signed int but line_range.start/end
are unsigned int, it is possible to be overflow when converting
line_range->start/end to line_finder->lno_s/e.
This changes line_range.start/end and line_list.line to signed int
and adds overflow checks when setting line_finder.lno_s/e.

LKML-Reference: <20100414223942.14630.72730.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index ab5492901708..e7ff0d02c0d4 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -74,15 +74,15 @@ struct perf_probe_event {
 /* Line number container */
 struct line_node {
         struct list_head        list;
-        unsigned int            line;
+        int                     line;
 };
 
 /* Line range */
 struct line_range {
         char                    *file;          /* File name */
         char                    *function;      /* Function name */
-        unsigned int            start;          /* Start line number */
-        unsigned int            end;            /* End line number */
+        int                     start;          /* Start line number */
+        int                     end;            /* End line number */
         int                     offset;         /* Start line offset */
         char                    *path;          /* Real path name */
         struct list_head        line_list;      /* Visible lines */